2010 Mercedes S-Class Owner's Manual - Page 405

At the gas station Mercedes-Benz Center to have the fuel system drained completely. X 403 Turn off the engine. ! To prevent damage to the catalytic converters, only use premium unleaded gasoline in this vehicle. Any noticeable irregularities in engine operation should be repaired promptly. Otherwise, excessive unburned fuel may reach the catalytic converter, causing it to overheat and potentially start a fire. i Only use premium unleaded gasoline with a minimum Posted Octane Rating of 91 (average of 96 RON/86 MON). Information on gasoline quality can normally be found on the fuel pump. Please contact gas station personnel in case labels on the pump cannot be found. For more information on gasoline, see "Premium unleaded gasoline" (Y page 541), see "Fuel requirements" (Y page 541), or contact an authorized Mercedes-Benz Center, or visit www.mbusa.com (USA only). Locking/unlocking the vehicle with the SmartKey or KEYLESS-GO automatically locks/unlocks the fuel filler flap. i Leaving the engine running and the fuel filler cap open can cause the yellow engine malfunction indicator lamp ; to illuminate. For more information, see also "Practical hints" (Y page 496). X Remove the SmartKey from the starter switch. KEYLESS-GO: Open the driver's door. This puts the starter switch in position 0, same as with the SmartKey removed from the starter switch. The driver's door then can be closed again. X Opening: Press fuel filler flap : at the point indicated by the arrow. X Turn fuel filler cap ; counterclockwise. X Take off fuel filler cap ;. X Place fuel filler cap ; in direction of arrow into holder =. X Fully insert filler nozzle unit and refuel. X Only fill your tank until the filler nozzle unit cuts out - do not top off or overfill. X Closing: Turn fuel filler cap ; clockwise until it audibly engages. i In case the central locking system does not release the fuel filler flap, or the opening mechanism is clamping, contact Roadside Assistance or an authorized Mercedes-Benz Center. The fuel filler flap is located on the right-hand side of the vehicle towards the rear. i Close the fuel filler flap before locking the vehicle. Otherwise the flap locking pin will prevent closing the fuel filler flap. X Close fuel filler flap :. Check regularly and before a long trip For information on quantities and requirements of operating agents, see "Fuels, coolants, lubricants, etc." (Y page 537). Check the following: REngine RTire oil level (Y page 405) level (Y page 408) lighting (Y page 504) Z inflation pressure (Y page 413) RCoolant RVehicle Operation